/*
 * Copyright (C) 2012 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import com.google.common.annotations.GwtCompatible;

import java.util.Collection;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Basic implementation of a {@link SortedSetMultimap} with a sorted key set.
 *
 * <p>This superclass allows {@code TreeMultimap} to override methods to return navigable set and
 * map types in non-GWT only, while GWT code will inherit the SortedMap/SortedSet overrides.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
abstract class AbstractSortedKeySortedSetMultimap<
        K extends @Nullable Object, V extends @Nullable Object>
        extends AbstractSortedSetMultimap<K, V>
{

    AbstractSortedKeySortedSetMultimap(SortedMap<K, Collection<V>> map)
    {
        super(map);
    }

    @Override
    public SortedMap<K, Collection<V>> asMap()
    {
        return (SortedMap<K, Collection<V>>) super.asMap();
    }

    @Override
    SortedMap<K, Collection<V>> backingMap()
    {
        return (SortedMap<K, Collection<V>>) super.backingMap();
    }

    @Override
    public SortedSet<K> keySet()
    {
        return (SortedSet<K>) super.keySet();
    }

    @Override
    Set<K> createKeySet()
    {
        return createMaybeNavigableKeySet();
    }
}
